Gallery: An injured person is treated in Barcelona after a white van jumped the sidewalk in the historic Las Ramblas district and crashed into a summer crowd of residents and tourists.

Manu Fernandez – Associated Press

Gallery: Children are escorted in Barcelona, Spain, Thursday, after a white van mounted a sidewalk, striking several people in the city's Las Ramblas district.

Manu Fernandez – Associated Press

Gallery: A police officer cordons off a street in Barcelona, Spain, Thursday, Aug. 17, 2017. Police in the northern Spanish city of Barcelona say a white van has jumped the sidewalk in the city's historic Las Ramblas district, injuring several people.

Manu Fernandez – Associated Press

Gallery: Police officers cordon off a street in Barcelona, Spain.

Sergi Alcazar/el Nacional – New York Times

Gallery: Some of the pedestrians injured when a van drove through crowds in Barcelona Thursday.

Sergi Alcazar/el Nacional – New York Times

Gallery: Paramedics tend to one of the many pedestrians struck by a van driving through crowds on Las Ramblas, Barcelona's most famous street, killing at least 12 on Thursday.

Oriol Duran, Associated Press
Injured people are treated in Barcelona, Spain, Thursday after a white van jumped the sidewalk in the historic Las Ramblas district.

A van veered onto a promenade and barreled down the busy walkway in central Barcelona on Thursday, swerving back and forth as it mowed down pedestrians and turned a picturesque tourist destination into a bloody killing zone. Thirteen people were killed and 100 were injured, 15 of them seriously, in what authorities called a terrorist attack.

00:39Footage has emerged of panic on Barcelona's streets after Thursday's van attack in the city's historic Las Ramblas district. Authorities say 13 people have died and more than 50 have been injured.